... 99 pcs 3.high clear voice 2.4GHz wireless audio intercom,supporting 99 pcs intercomElectrical Features1. Using ... pressing success (if already pressed the number key for 2 times, the third pressing on the ... 4s, and the green light will flash, for one time after 4s clearing record.Coding to ... ..’ for 3 times, then exit ID setting mode and return to setting status. 2.4GHz wireless intercom doorbell for 99 ...